Assertion failed on expression: 'modifications.empty()' UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Hi all
I have imported CrossPlatformInput from Standart Assets to my project. But when I try to embed
MobileSingleStickControl to my scene I get this error


Assertion failed on expression: ‘modifications.empty()’
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)


Can someone help?

Thanks

is there any way to solve this error?